Thevenin's equivalent of wheatstone bridge

AI Thread Summary
Calculating the Thevenin equivalent of a Wheatstone bridge can lead to undefined results when both open-circuit voltage (Vos) and short-circuit current (Isc) are zero. In such cases, the Thévenin voltage is also 0V. To determine the Thevenin resistance, apply a voltage across the terminals and measure the resulting current. Alternatively, short-circuit the source and assess the resistance from the terminals. This method provides a practical approach to finding the Thevenin resistance when traditional calculations fail.
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Hi guys, I tried to calculate the Vos and Isc and both of them are zero..so the Thevenin's resistance is 0/0=undefined. How do I calculate the resistance when Vos/Isc fails,such like the wheatstone bridge?
 
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The Thévenin voltage will be 0V. To measure R you could apply a voltage to the terminals and measure the current that flows in.

To calculate R you short-circuit its source and determine the resistance seen looking in at the trrminals.
 
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